ARM: dts: uniphier: fix W=2 build warnings

Fix warnings like follows:

Warning (node_name_chars_strict): Character '_' not recommended in ...

Commit 8654cb8d ("dtc: update warning settings for new bus and
node/property name checks") says these checks are a bit subjective,
but Rob also says to not add new W=2 warnings.

The exising warnings should be fixed in order to catch new ones
easily.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/boot/dts/uniphier-ld4.dtsi

@@ -37,7 +37,7 @@ refclk: ref {
 			clock-frequency = <24576000>;
 		};
 
-		arm_timer_clk: arm_timer_clk {
+		arm_timer_clk: arm-timer {
 			#clock-cells = <0>;
 			compatible = "fixed-clock";
 			clock-frequency = <50000000>;

arch/arm/boot/dts/uniphier-pinctrl.dtsi

@@ -8,117 +8,117 @@
  */
 
 &pinctrl {
-	pinctrl_aout: aout_grp {
+	pinctrl_aout: aout {
 		groups = "aout";
 		function = "aout";
 	};
 
-	pinctrl_emmc: emmc_grp {
+	pinctrl_emmc: emmc {
 		groups = "emmc", "emmc_dat8";
 		function = "emmc";
 	};
 
-	pinctrl_ether_mii: ether_mii_grp {
+	pinctrl_ether_mii: ether-mii {
 		groups = "ether_mii";
 		function = "ether_mii";
 	};
 
-	pinctrl_ether_rgmii: ether_rgmii_grp {
+	pinctrl_ether_rgmii: ether-rgmii {
 		groups = "ether_rgmii";
 		function = "ether_rgmii";
 	};
 
-	pinctrl_ether_rmii: ether_rmii_grp {
+	pinctrl_ether_rmii: ether-rmii {
 		groups = "ether_rmii";
 		function = "ether_rmii";
 	};
 
-	pinctrl_i2c0: i2c0_grp {
+	pinctrl_i2c0: i2c0 {
 		groups = "i2c0";
 		function = "i2c0";
 	};
 
-	pinctrl_i2c1: i2c1_grp {
+	pinctrl_i2c1: i2c1 {
 		groups = "i2c1";
 		function = "i2c1";
 	};
 
-	pinctrl_i2c2: i2c2_grp {
+	pinctrl_i2c2: i2c2 {
 		groups = "i2c2";
 		function = "i2c2";
 	};
 
-	pinctrl_i2c3: i2c3_grp {
+	pinctrl_i2c3: i2c3 {
 		groups = "i2c3";
 		function = "i2c3";
 	};
 
-	pinctrl_i2c4: i2c4_grp {
+	pinctrl_i2c4: i2c4 {
 		groups = "i2c4";
 		function = "i2c4";
 	};
 
-	pinctrl_nand: nand_grp {
+	pinctrl_nand: nand {
 		groups = "nand";
 		function = "nand";
 	};
 
-	pinctrl_nand2cs: nand2cs_grp {
+	pinctrl_nand2cs: nand2cs {
 		groups = "nand", "nand_cs1";
 		function = "nand";
 	};
 
-	pinctrl_sd: sd_grp {
+	pinctrl_sd: sd {
 		groups = "sd";
 		function = "sd";
 	};
 
-	pinctrl_sd1: sd1_grp {
+	pinctrl_sd1: sd1 {
 		groups = "sd1";
 		function = "sd1";
 	};
 
-	pinctrl_system_bus: system_bus_grp {
+	pinctrl_system_bus: system-bus {
 		groups = "system_bus", "system_bus_cs1";
 		function = "system_bus";
 	};
 
-	pinctrl_uart0: uart0_grp {
+	pinctrl_uart0: uart0 {
 		groups = "uart0";
 		function = "uart0";
 	};
 
-	pinctrl_uart1: uart1_grp {
+	pinctrl_uart1: uart1 {
 		groups = "uart1";
 		function = "uart1";
 	};
 
-	pinctrl_uart2: uart2_grp {
+	pinctrl_uart2: uart2 {
 		groups = "uart2";
 		function = "uart2";
 	};
 
-	pinctrl_uart3: uart3_grp {
+	pinctrl_uart3: uart3 {
 		groups = "uart3";
 		function = "uart3";
 	};
 
-	pinctrl_usb0: usb0_grp {
+	pinctrl_usb0: usb0 {
 		groups = "usb0";
 		function = "usb0";
 	};
 
-	pinctrl_usb1: usb1_grp {
+	pinctrl_usb1: usb1 {
 		groups = "usb1";
 		function = "usb1";
 	};
 
-	pinctrl_usb2: usb2_grp {
+	pinctrl_usb2: usb2 {
 		groups = "usb2";
 		function = "usb2";
 	};
 
-	pinctrl_usb3: usb3_grp {
+	pinctrl_usb3: usb3 {
 		groups = "usb3";
 		function = "usb3";
 	};

arch/arm/boot/dts/uniphier-pro4.dtsi

@@ -45,7 +45,7 @@ refclk: ref {
 			clock-frequency = <25000000>;
 		};
 
-		arm_timer_clk: arm_timer_clk {
+		arm_timer_clk: arm-timer {
 			#clock-cells = <0>;
 			compatible = "fixed-clock";
 			clock-frequency = <50000000>;

arch/arm/boot/dts/uniphier-pro5.dtsi

@@ -37,7 +37,7 @@ cpu@1 {
 		};
 	};
 
-	cpu_opp: opp_table {
+	cpu_opp: opp-table {
 		compatible = "operating-points-v2";
 		opp-shared;
 
@@ -119,7 +119,7 @@ refclk: ref {
 			clock-frequency = <20000000>;
 		};
 
-		arm_timer_clk: arm_timer_clk {
+		arm_timer_clk: arm-timer {
 			#clock-cells = <0>;
 			compatible = "fixed-clock";
 			clock-frequency = <50000000>;

arch/arm/boot/dts/uniphier-pxs2.dtsi

@@ -60,7 +60,7 @@ cpu3: cpu@3 {
 		};
 	};
 
-	cpu_opp: opp_table {
+	cpu_opp: opp-table {
 		compatible = "operating-points-v2";
 		opp-shared;
 
@@ -110,7 +110,7 @@ refclk: ref {
 			clock-frequency = <25000000>;
 		};
 
-		arm_timer_clk: arm_timer_clk {
+		arm_timer_clk: arm-timer {
 			#clock-cells = <0>;
 			compatible = "fixed-clock";
 			clock-frequency = <50000000>;

arch/arm/boot/dts/uniphier-sld8.dtsi

@@ -37,7 +37,7 @@ refclk: ref {
 			clock-frequency = <25000000>;
 		};
 
-		arm_timer_clk: arm_timer_clk {
+		arm_timer_clk: arm-timer {
 			#clock-cells = <0>;
 			compatible = "fixed-clock";
 			clock-frequency = <50000000>;

arch/arm/boot/dts/uniphier-support-card.dtsi

@@ -11,7 +11,7 @@ &system_bus {
 	status = "okay";
 	ranges = <1 0x00000000 0x42000000 0x02000000>;
 
-	support_card: support_card@1,1f00000 {
+	support_card: support-card@1,1f00000 {
 		compatible = "simple-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;